One common theme is adventure. Many fanfics put Alex Hogh Andersen's character in various adventurous situations, like exploring new lands or going on quests. Another theme is friendship. His character often forms new friendships or strengthens existing ones in these stories. Love is also a common theme, with his character falling in love or having romantic interests.
In a Naruto and High School DxD fanfiction, there could be a scenario where the protagonists of both stories meet in a neutral dimension. Issei from High School DxD might be intrigued by Naruto's ninja skills and determination. Naruto, in turn, could be curious about Issei's Sacred Gear. They could start training together, sharing their knowledge and skills, and ultimately have to face a common enemy that threatens both their worlds.
There are quite a few Alex Hogh Andersen fanfics out there. For example, 'Alex's Journey Beyond the Screen' is a fan - created story that follows his character as he steps out of the fictional world and into a real - world - like scenario. It has elements of adventure, self - discovery, and some really engaging dialogues. 'Alex and the Mysterious Quest' is another one where he embarks on a mysterious adventure filled with magic and mystery, which is a great read for fans who like fantasy - themed stories.
One possible fanfiction could be about Naruto characters attending the school in High School DxD. For example, Naruto's positive and determined attitude might clash with the more complex social and power dynamics in the DxD world. He could make new friends or even rivals among the devils, angels, and fallen angels.
One idea could be that Ben Tennyson somehow gets transferred to the world of High School DxD. He has to keep his alien forms a secret while dealing with the devils, angels, and fallen angels in the school. Maybe his Omnitrix could be misinterpreted as some kind of powerful devil device.
One possible fanfiction could be about Naruto characters somehow ending up in the world of High School DxD. Maybe Naruto's skills in combat and his determination would make him a formidable opponent in the battles that often occur in the High School DxD universe. He could form interesting alliances or rivalries with the characters there.
A fanfiction could focus on Naruto's training regime influencing the characters in High School DxD. His intense physical and mental training could inspire the students at the school. They might start incorporating some of his training methods, like running up trees or on water, to improve their own strength. And Naruto could also learn from their magic-based training and combine it with his chakra control for new and powerful techniques.